The term omnisciency refers to the state of knowing all things. However, there are several other synonyms for this term that can be used in different contexts. For instance, one can use the term "omniscience" to mean all-knowing. Another word that can be used as a synonym for omnisciency is "omnipotence," which refers to the state of being all-powerful. Additionally, the term "omnipresence" can also be used to describe the ability to be present everywhere at the same time. Each of these synonyms can be used to describe a different aspect of the ability to perceive and comprehend all things.